Apart from that I hat my entities not tracked (.AsNoTracking()) so it claimed that all the columns were changed, when I overwrote the db-entry. What do hollow blue circles with a dot mean on the World Map? The update is no longer correct, and needs to be fixed. If you are relying on automated change capture of some sort (such as your own triggers, temporal table features in postgres and the upcoming MSSQL2016) to track changes then you (or your end users) need to decide if the data model should care that a no-change update happened or not. Explicitly write a last changed timestamp, a "must be queries" flag, or something like this to a tracking table whenever I change something in a source table. If you want to update the object in question, it should be through the use of the class I'm writing. Is there any performance benefit in putting a check in the WHERE clause to prevent the update? Query Notification does exactly that, it will set up a notification if any data has changes and you need to refresh your query. Imagine someone changes "Dob" to "DateOfBirth" during a refactor. Simple deform modifier is deforming my object. In 5e D&D and Grim Hollow, how does the Specter transformation affect a human PC in regards to the 'undead' characteristics and spells? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How are engines numbered on Starship and Super Heavy? Why did DOS-based Windows require HIMEM.SYS to boot? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to force Unity Editor/TestRunner to run at full speed when in background? Heck, what's "right" might even vary between classes or projects. How can I backup my large SQL Server table? For updatable rows add a "dirty" flag. Why refined oil is cheaper than cold press oil? ', referring to the nuclear power plant in Ignalina, mean? One method is to compare each column in the WHERE clause separating each comparison with an OR. The problem here is that when you map a view model into an entity object, all of the values get overwritten. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The other option is to use an AutoMapper, but I do not think they are safe. This looks overly complicated vs checking for updates in a simple WHERE clause for the simple scenerio in the original question when you are updating one value for all rows in a table with a literal value. I have 50 columns in my table but I displayed only 25 fields in my form (I need to partially update my table, with remaining 25 column retain same old value). So the original proposal amounts to 396 lock/unlock operations per second, while this new method amounts to only 264 lock/unlock operations per second of even lighter-weight locks. If no other processes are interacting with this table then it is probably a non-issue (but how likely is that, really?). Find centralized, trusted content and collaborate around the technologies you use most. By default I have found that as long as change tracking is enabled (it is by default unless you turn it off), Entity Framework will do a good job of applying to the database only what you ask it to change. Trigger: If you want the trigger only to be fired if there was a real change, you need to implement your trigger like so, that it compares all old values to the new values before doing anything. Asking for help, clarification, or responding to other answers. You can combine the update and insert into one statement. Generating points along line with specifying the origin of point generation in QGIS. The code you posted should do what you are looking for when you insert. Performance of updating row if content has changed, https://stackoverflow.com/questions/9766717/, How a top-ranked engineering school reimagined CS curriculum (Ep. If we want to avoid the overhead of these writes when not necessary we have to devise a way to check for the need to be updated.

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